Plant & Soil Sciences eLibraryPRO
control panel control panel

Golden Rice

Rate Me

How does Golden Rice works - Gene transformation foundation


Gene transformation foundation: Beta-carotene is a pigment involved in photosynthesis. However, in the endosperm part of rice, the part we eat, no photosynthesis exists and beta-carotene is not accumulated. So, to give rice endosperm the character of producing beta-carotene, gene recombinant technologies was considered, which means genes from other organisms should be transformed into the rice genome.

Although there is no beta-carotene formed, immature rice endosperm is capable of synthesizing the early intermediate geranylgeranyl diphosphate (“GGPP” in Fig. 3), which gives us a chance. Firstly, uncolored carotene phytoene can be produced from geranylgeranyl diphosphate by expressing the phytoene synthase in rice endosperm. For this reason, psy gene was introduced from daffodil (Narcissus pseudonarcissus). The first step of “To be supplemented” section in Fig 3 was accomplished. Secondly, beta-carotene can be produced from downstream reactions catalyzed by three additional enzymes: phytoene desaturase, xi-carotene desaturase, and lycopene beta-cyclase. As a crucial breakthrough, crtI gene was found in a soil bacterium Erwinia uredovora, bearing the capability of inducing all these functions in a single transgene (CrtI section in Fig. 3).


Be the first to write a comment...

Control Panel cancel

Create activities for your moodle courses. Moodle Go to moodle
Select and group e-Library Lessons to create your own package... My Communities
Community Blogs Community Media

My Joined Communities

My Blogs - a journal of my thoughts... My Blogs
My Comments - my thoughts expressed as a feedback... My Comments
Classes that I am taking Registered Classes
Class Blogs Class Media
Check the scores of assesments that you have taken Taken Assessments
Please confirm your selection.